/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* This file defines structures needed by udf functions */ #ifdef USE_PRAGMA_INTERFACE #pragma interface #endif enum Item_udftype {UDFTYPE_FUNCTION=1,UDFTYPE_AGGREGATE}; typedef struct st_udf_func { LEX_STRING name; Item_result returns; Item_udftype type; char *dl; void *dlhandle; void *func; void *func_init; void *func_deinit; void *func_clear; void *func_add; ulong usage_count; } udf_func; class Item_result_field; struct st_table_list; class udf_handler :public Sql_alloc { protected: udf_func *u_d; String *buffers; UDF_ARGS f_args; UDF_INIT initid; char *num_buffer; uchar error, is_null; bool initialized; Item **args; public: table_map used_tables_cache; bool const_item_cache; bool not_original; udf_handler(udf_func *udf_arg) :u_d(udf_arg), buffers(0), error(0), is_null(0), initialized(0), not_original(0) {} ~udf_handler(); const char *name() const { return u_d ? u_d->name.str : "?"; } Item_result result_type () const { return u_d ? u_d->returns : STRING_RESULT;} bool get_arguments(); bool fix_fields(THD *thd,struct st_table_list *tlist,Item_result_field *item, uint arg_count,Item **args); double val(my_bool *null_value) { if (get_arguments()) { *null_value=1; return 0.0; } double (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)= (double (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func; double tmp=func(&initid, &f_args, &is_null, &error); if (is_null || error) { *null_value=1; return 0.0; } *null_value=0; return tmp; } longlong val_int(my_bool *null_value) { if (get_arguments()) { *null_value=1; return LL(0); } longlong (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)= (longlong (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func; longlong tmp=func(&initid, &f_args, &is_null, &error); if (is_null || error) { *null_value=1; return LL(0); } *null_value=0; return tmp; } my_decimal *val_decimal(my_bool *null_value, my_decimal *dec_buf); void clear() { is_null= 0; void (*func)(UDF_INIT *, uchar *, uchar *)= (void (*)(UDF_INIT *, uchar *, uchar *)) u_d->func_clear; func(&initid, &is_null, &error); } void add(my_bool *null_value) { if (get_arguments()) { *null_value=1; return; } void (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)= (void (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func_add; func(&initid, &f_args, &is_null, &error); *null_value= (my_bool) (is_null || error); } String *val_str(String *str,String *save_str); }; #ifdef HAVE_DLOPEN void udf_init(void),udf_free(void); udf_func *find_udf(const char *name, uint len=0,bool mark_used=0); void free_udf(udf_func *udf); int mysql_create_function(THD *thd,udf_func *udf); int mysql_drop_function(THD *thd,const LEX_STRING *name); #endif